Sofa



FIG. 1 is a front elevational view of a sofa in accordance with the present invention;

FIG. 2 is a top plan view of the sofa;

FIG. 3 is a rear elevational view of the sofa; and,

FIG. 4 is right elevational view, the left side being a mirror image thereof. 

The ornamental design for a sofa, as shown and described. 